LMN Texas Instruments Analog Comparators Low Power Low Offset Voltage Dual Comparator 8-PDIP to 85 datasheet, inventory, & pricing. LMMX/NOPB. ACTIVE. SOIC. D. 8. Green (RoHS. & no Sb/Br). CU SN . LevelC-UNLIM. to LM. M. LMN/NOPB. ACTIVE. PDIP. Features: Single Supply Operation: 2 V to 36 V; Dual Supply Operation: ±1 V to ± 18 V; Allow Comparison of Voltages Near Ground Potential; Low Current Drain.
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Just for grins – since you want to learn about comparators – it might be fun to take a look at the two circuits below and figure out why VOUT2 switches and VOUT1 doesn’t, even though VIN is the same input to both circuits.
In general, inputs come from the left and the top of the drawing, and outputs go out the bottom and the right, kinda like this, after adding the pullup to the comparator’s output: Sign up or log in Sign up using Google. In general, inputs come from the left and the top of the drawing, and outputs go out the bottom and the right, kinda like this, after adding the pullup to the comparator’s output:. If you have a new question relating to a car horn, you should ask it separately.
Thank you for pointing this out and I will go back over the datasheet to get a better understanding of how to read it. Can anyone help me come up with ideas to try and get this working? Since your original question has been dealt with to your satisfaction, it’s done with. The horn is about 15 ohms. Left click on the graphic to make it go full-screen and, by the way, here’s the LTspice circuit list just in case you want to play with the circuit s:.
The LM has an open collector output so it can not actively drive a positive voltage. Sign up using Facebook. Home Questions Tags Users Unanswered. I will look into your question. Unfortunately, that ohm pullup I showed is more than likely causing the problem, and it should be more like 10k for an LM For a better handle on what’s going on with an LM, take a a look at the data sheetparticularly at Figure 3. After testing the pull up resistor, I am left wondering when I invert the inputs I do not get 0v like I was expecting.
You’ll never get 0V out with GND equal to zero volts, no matter what, because of the saturation resistance of the comparator’s output transistor. You need to add a pull-up resistor of about 10k between the lm29903n pin and your positive supply rail. Can you describe what you mean by “invert the inputs” by editing your question, please? The LM has an open-collector output.
Left click on the lm203n to make it go full-screen and, by the way, here’s the LTspice circuit list just in case llm2903n want to play with the circuit s: Steve G 4, 1 7 I looked over the datasheet for 3 days and didn’t see the typical application.
Sign up using Email and Password. They helped a lot. Why is this happening. My wiring diagram looks similar to this picture I created in LTspice.
Comparator help (LmN) – Electrical Engineering Stack Exchange
Matthew Tubbs 5 1. Comparator help LmN Ask Question. Also, thanks for the 10K resistor idea that got the voltage down to what I was hoping to see.
Say I want to use the 12v Vout to make my horn go off on my car. I mistakenly thought the inverted its output.
I am using a LMN to learn about comparators. You need a pullup resistor.
LM2903N ON Semiconductor, Dual Comparator, Open Collector O/P, 0.2 μs, 1.4 μs 2 → 36 V 8-Pin PDIP
Post as a guest Name. Thanks for the drawings. You might want to try making your drawings easier to read, since that makes it much easier for us to follow the circuit’s ins and outs.